[jules]

You're reading a meaning that isn't there. The author is not expecting scientists (or farmers) to be indecent, he is merely expecting them to be equally decent as non scientists (or non farmers). He's not surprised specifically that there is a positive correlation, he's surprised that there is a correlation at all.

[grepherder]

You're right, I might have misinterpreted. He didn't actually write anything else that implies he found the positive correlation counterintuitive. I don't know what the author's actual meaning was, so I still can't say for sure, but you're right, there was some cognitive bias involved in my reading. My apologies to the author.